With the information provided I can't do much more here, you can test it yourself, install a commerce kickstart somewhere, download price table module and check this feature.

Maybe there are some module incompatibilities but I'm going to need much more information that the provided here, without a consistant way to reproduce this issue, it's not likely that a fix can be provided.

So you are saying, that your drupal commerce kickstart install (which is the same as mine) does not have this problem?

I'll gladly give you an ssh account on the machine it's running on (it's a test machine - but we use it for other tests as well :) - with rights to modifying files in that sites folder, if that can help. Just email me at kl@vsen.dk